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How to allow other website updating our information

I am programming a website for real estate's agents. In this website each agent (about 30) can publish the property they are managing from a private section of this common website.
Of course some of those agents have already a website on their own. I have been asked to find out a way so they don't need to reenter each property on this common website. That sounds fair enough.
I want to find a rather easy way to update our database. As you can imagine most of those website have their own way of storing the information, some are in PHP other in ASP using MySql, Access or other programming language or db. The main system, the one I am writing, is in ASP.NET.
Any idea on how to achieve this ?